In 2016, Carlos and Christian went to the first official Domain-Driven Design conference, DDD Europe. They were really happy to see some PHP open source leaders, such as Marco Pivetta (Doctrine) and Sebastian Bergmann (PHPUnit), attending the conference.

Domain-Driven Design arrived in the PHP community two years prior to that conference. However, there's still a lack of documentation and real code examples. Why? We think not many people have worked with this kind of approach in production yet — even people in other more established communities such as Java. Maybe this is because their project complexity is low, or maybe it's because they don't know how to do it. Whatever the reason, this book is written for the community. One of our goals is to teach you how you can write an application that solves your Domain issues without being coupled to specific frameworks or technologies.